Means for facilitating sharpening of augers or bits



Nov. 13, 1923.

' A. W. M CURDY MEANS FOR FACILITATING SHARP ENING OF AUGERS 0R BITS Original Filed April 1, 1922 Patented Nov. 13, i923. onirsn stares ARTHUR W. MCGURDY, OF MALAHAT, BRITISH COLUMBIA, CANADA.

MEANS FOR FACILITATING SHAEPENING OF AUG-ERS OR BITS.

Continuation of application Serial No. 548,796, filed April 1, 1922. This application filed. November 11, 1922. Serial No. 600,469.

To all whom it may concern: surfaces; both as to form and angularity, will Be it known that I, ARTHUR W. MoCUnnY, vary according to the form and contour of a subject of the King of Great Britain, re the particular bit which it is designed or desicling at Malahat, British Columbia, Canasired to sharpen. da, have invented certain new and useful The main body of the combined clamp ,9 Improvements in Means for Facilitating and tool guide may be said to comprise a Sharpening of Angers or Bits, of which the body 1 having a jaw 2 formed integrally following is a specification. therewith, the outer face of the jaw being This invention pertains to an improved flattened as at 3, while the inner face 4- is 10 means for facilitating the accurate sharpcurved, such curved face being formed as (55 ening of angers or bits. an extension of the cylindrical bore or open- The structure is such that it may be readiing 5 which extends upwardly through the ly positioned on the bit and its gage and body and a head or extension 6 formed on guiding surfaces for the sharpening tools the body. The body opposite jaw 2 is quickly brought into proper junta-position formed with a depending lug 7 in which is 7 with the cutting edges or elements of the bit provided an elongated horizontally disposed which is to be sharpened. slot 8.

Angers or bits to maintain them in prop- Lug 7 is adapted to enter a socket or recess or working condition, require that the cut- 9 formed in a second semi-cylindrical jaw 10 ting elements thereof be sharpened more or having ii e 11 rm d x e i y 0f the 75 less frequently, and the angle or pitch of the jaw. A hinge pin 12 secured in the jaw and cutting elements when sharpened should, of passing through slot 8 connects said movable course, bear a fixed relation to each other j aw to the body of the clamp, permitting the nd t th axis of the bit, The present niova-ble jaw to move inwardly parallel to structure is designed to produce a combined the Opposite jaw so that the bit body denoted so holder for the bit and a guide for the sharp by 13 may be lightly clamped by a slight ening tool or tools which facilitates positionp ssure exer d by the operators fingers. ing and clamping of the bit and ensures the The parallel flat faces 3 and 11 enable the cutting away or sharpening of the cutting clamp to be securely held in a vise when the elements of the bit to the necessary extent bit is brought to its final adjusted position and to the proper angularity. Y in the combined clamp and tool guide.

One form of the combined clamp and With a bit having a single floor lip cutter, guide, adapted more especially for the sharpas 14-, and a single lip or chisel cutter 15,

ening of a bit or auger such as set forth and see Fig. 6, the head 6 is provided with an 35 claimed in my co-pending application, Serial inclined guiding or tool bearing face 16, said No. 248,747, having a floor lip cutter formed face extending about or around the outer on one of the spirals thereof and a chisel end to an extent slightly less than half the cutter formed as the continuation of the diameter of the head. its lower end termiother spiral, is illustrated in the annexed natcs adjacent an upstanding wall 17, while 40 drawings, wherein; the higher end terminates in line with the Fig. l is a sectional elevation of the holder wall 18 forming part of a cross groove or and bit; depression 19 likewise formed in the outer Fig. 2 a like view as seen at right angles end of the head. Said groove which is into Fig. l; terrupted by the bore 5 lies to one side of Fig. 8 a top plan view, with the bit or the center of said bore, so that when the auger in place; bit is positloned its center pin or point 20 Fig. 4 a horizontal section on the line Stands ust outside of the groove. The lV-IV of Fig. 1; groove is made wider at one end than the Fig. 5 a perspective view of the two eleother and the outer wall thereof is curved 50 ments of the clamp shown as separated; and outwardly to a slight extent, so that the Fig. 6 a perspective view of the cutting Sharpening tool may bring the chisel cutter end of the bit for which the guiding surfaces down to a fine cutting edge. on the clamp for the sharpening tools are A cross mark 21, Fig. 5, is provided upon devised or arranged. the inclined tool guiding face 16 in order 5 it will, of course, be understood that such that the cutting elements of the bit may be readily and accurately positioned with reference to the tool guiding surfaces. The clamp will preferably be produced from steel which is case hardened so that the guiding surfaces for the sharpening tools will remain unaffected thereby.

When the bit is positioned and clamped in place, the operator has only to pass a file or other sharpening tool over the floor lip cutter 14; until such time as the tool takes a firm and full bearing on the guide face 16, by which time the lip cutter will be provided with a new and sharp cutting edge. It. suitablyshaped file is then brought to bear against the lip cutter 11.5 and it is reduced and sharpened until the lip and the f oor of the twist on which the cutter is formed lie or stand in aiineinent witn the walls of the groove at which time the abrasive action of the cutter is arrested thereby.

It will be noted that the depth of the groove is such that the body of the twist upon the edge or land of which the chisel cutter is formed will be cut away or removed so that it lies in a plane in rear of the floor lip cutter 14:, as will be seen upon reference to Figs. 2 and 6.

This application is a continuation of my application Serial No. 5l8fl96, filed April 1, 1922, as a renewal of my application Serial No. 261,367, filed as of November 6, 1918.

What is claimed is: i

1. In a sharpening tool guide for augers and bits, the combination of a body having an opening therein. for the reception of the bit body; and a plurality of combined tool guiding and gage surfaces formed on the outer end of the b0( y, said surfaces being fashioned to conforln'to the contour and an- 'ularity of the cutting elements of the bit.

2. In a sharpening tool guide for angers and bits, the combination of a body having an opening therein for the reception of the bit body; a flat inclined surface formed on the end of the body and adapted to serve as a. guide for the tool which acts upon the floor lip cutter of the bit; and a groove also the end of the body said groove formed on serving as a guide and for the sharpening tool which acts upon the chisel cutter.

3. In a sharpening tool guide for angers and bits. the combination of a body having an opening therethrougrh for the reception of the bit body; a flat inclined surface formed on the outer end of the body and extending through a distance less than one half of circumference of the opening-aforesaid said surface serving as a guide and gage for the sharpening tool employed upon theiloor lip cutteryand a groove extending across the body and opening therein, said groove being arranged to one side of the axis of the body and serving as a guide'and page for the tool employed to sharpen the chisel cutter of the bit. 7

l. in a combined clamp and sharpening tool guide for angers and hits, the combina tion of a body having? an opening extending thercthrough for the reception of the bit body; guiding; and gage surfaces formed on the outer end thereof for the sharpening tools; and clamping jaw hinged to the body and adapted when moved inwardly to cooperate with the opposite body portion to clamp the bit body.

5. in a combined clamp and sharpening tool guide for augers and hits, the combination of a body having an opening extending iherethrough for the reception of the bit body; guiding and surfaces formed on the outer end thereof for the sharpening tools; and a clamping aw having a sliding hinged connection to the body and adapted when moved inwardly to cooperate with the opposite body portion to clamp the bit body.

6. In a combined clamp and sharpening tool guide for angers and hits, the combination of a body portion having an outwardly extending end or head with an opening extending therethrough for the reception of the bit body; an inclined flat bearing and surface formed upon the end of said outwardly extending end, said surface extending about the opening short of one half of the circumference thereof; a tool guiding groove or channel extending across such outwardly extending: end, to one side of the axis of the holder and opposite to that of the inclined surface; and a clamping jaw having a sliding hinged connection with the body and adapted when moved inwardly to cooperate with the opposite body portion to clamp the bit body, the outer face of the jaw and the corresponding face of the body being flattened.

in testimony whereof I have signed my name to this specification.

ARTHUR W. MOCURDY.

the 

